Change comment symbol from ; to // when pressing Cmd-/

I’m writing assembly code using PlatformIO, and I hit a small annoyance. I’m used to the keyboard shortcut Cmd+/ for commenting a line or block of lines. However, PlatformIO uses the ; symbol for comments, which my toolchain doesn’t like. I tested // manually and it works. I confirmed this a PlatformIO issue by using the “Change Language Mode” VS Code command and observing that “Assembly (platformio-debug.asm)” is the selected mode.

However, Cmd+/ is a real time saver and I’d love for it to work, so I’m asking: is there a setting or file I can edit to make it use // in place of ; when pressing Cmd+/?